destination delivery unit
21Social Protection — ▪ 2006 Introduction With medical costs skyrocketing and government programs scaled back, citizens bore more responsibility for their health care costs; irregular migration, human trafficking, and migrant smuggling posed challenges for… …
22postal system — System that allows persons to send letters, parcels, or packages to addressees in the same country or abroad. Postal systems are usually government run and paid for by a combination of user charges and government subsidies. There are early… …
23Communications protocol — For other senses of this word, see Protocol. A communications protocol is a system of digital message formats and rules for exchanging those messages in or between computing systems and in telecommunications. A protocol may have a formal… …
24railroad — /rayl rohd /, n. 1. a permanent road laid with rails, commonly in one or more pairs of continuous lines forming a track or tracks, on which locomotives and cars are run for the transportation of passengers, freight, and mail. 2. an entire system… …
25United States — a republic in the N Western Hemisphere comprising 48 conterminous states, the District of Columbia, and Alaska in North America, and Hawaii in the N Pacific. 267,954,767; conterminous United States, 3,022,387 sq. mi. (7,827,982 sq. km); with… …
26Air traffic control — For the Canadian musical group, see Air Traffic Control (band). Airport Traffic Control Towers (ATCTs) at Amsterdam s Schiphol Airport, the Netherlands …
27Media and Publishing — ▪ 2007 Introduction The Frankfurt Book Fair enjoyed a record number of exhibitors, and the distribution of free newspapers surged. TV broadcasters experimented with ways of engaging their audience via the Internet; mobile TV grew; magazine… …
28Transmission Control Protocol — The Transmission Control Protocol (TCP) is one of the core protocols of the Internet Protocol Suite. TCP is so central that the entire suite is often referred to as TCP/IP. Whereas IP handles lower level transmissions from computer to computer as …
29Packet (information technology) — In information technology, a packet is a formatted unit of data carried by a packet mode computer network. Computer communications links that do not support packets, such as traditional point to point telecommunications links, simply transmit… …
30Abkürzungen/Luftfahrt/B–D — Dies ist der zweite Teil der Liste Abkürzungen/Luftfahrt. Liste der Abkürzungen Teil 1 A A Teil 2 B–D B (BA, BB, BC, BD, BE, BF, BG, BH, BI, BJ, BK, BL …
